Thiazepines and related compounds



United States Patent 3,351,632 THIAZEPINES AND RELATED COMPOUNDS Rudolf G. Griot, Flurham Park, N.J., assiguor to Sandoz Inc., Hanover,'N.J.

No Drawing. Original application Mar. 4, 1964, Ser. No. 349,492. Divided and this application Feb. 2, 1967, Ser. No. 627,238

8 Claims. (Cl. 260-327) ABSTRACT OF THE DISCLOSURE The compounds are 5-(lower) alkoxy 2,3,6,7 tetrahydro-l,4-oX-(or thi-)azepines and S-carboxymethylimino- .hexahydro-lA-ox-(or thi-)azepines, which are intermediates for the preparation of 4-oxa-(or thia-)l,8-diaza bicyclo(5,3,0)-decen-A' 100nes, useful as psychic energizers and antihypertensives.

This is a division or" application Ser. No. 349,492 filed Mar. 4, 1964.

This invention concerns compounds of the formulae N r W S 0=-N (I) and W X, 0 N

wherein R is the residue of an tat-(primary) amino acid, H NRCOOH, having only one primary amino group.

These compounds are prepared by reacting any a-(primary)amino carboxylic acid (III) with a lower alkyl lactim ether (IV) to form an amidino acid (V) according to the reaction scheme:

and thereafter effecting ring closure by dehydration according to the reaction scheme:

-the contemplation of this invention, as well as the novel amidino acid intermediates (V). Exemplary of acids of,

' addition are: hydrochloric acid, salicyclic acid, citric acid,

tartaric acid, methanesulfonic acid, paratoluenesulfonic acid, acetic acid, sulfonic acid, maleic acid and oxalic acid. The acid addition salts are prepared from the free bases .(VI) in accordwith well .known analogous procedures.

Exemplary of R is each of the corresponding residues of the u-(primary)amino monocarboxylic acids,

enumerated in Fieser, Louis F., and Fieser, Mary, Organic Chemistry, Table I, pages 405 and 406, D. C. Heath and Company, 1944, and which contain only one primary amino group.

The final products (compounds VI) of this invention and their therapeutically acceptable acid addition salts are useful as psychic energizers (evidenced by monamine oxidase inhibiting activity) and antihypertensives. In addition compounds I are mood stabilizers and compounds II are diuretics and antinfiammatory agents. They can be ad ministered either orally or parenterally in doses of as much as 300 milligrams per day.

Compounds VI and therapeutically acceptable acid addition salts thereof are also useful as intermediates in the preparation of saturated compounds of the structure R is hydrogen (H); lower alkyl, e.g. methyl, isopropyl, butyl and hexyl; phenyl; or phenyl(lower)alkyl, e.g. benzyl;

Hal is either chlorine (--C1), bromine (-Br) or iodine (I) and each of R and X has the same meaning as hereinbefore defined. Compounds VI are also hydrogenated in an inert solvent according to well-known procedures with a suitable catalyst:

Compounds IX are further useful according to the reaction:

( Ill N R Y (IX) j l x wherein R is either hydrocarbon [saturatedlower alkyl, e.g. propyl; ethylenically unsaturated lower aliphatic, e.g. allyl; acetylenically unsaturated lower aliphatic, e.g. propargyl; monocarbocyclic ar(lower)alkyl, e.g. benzyl] or carboxylic acid acyl [unsubstituted phenyl-keto- (lower)alkyl; e.g. phenyl-keto-propyl; substituted phenyl-keto-(lower) alkyl, e.g. p-fiuorophenyl-keto-propyl];

Y is either chlorine (-Cl) or bromine (-Br); and

each of R and X has the same meaning as hereinbefore defined.

Compounds VII, IX and X and their pharmaceutically acceptable acid addition salts are useful in the same manner and for the same therapeutic purpose as compounds VI. The acid addition salts are prepared, according to well-known procedures, by neutralizing a solution of the free base with the acid of addition.

The following examples illustrate the invention, the parts and percentages being by Weight unless otherwise stated, and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter. All temperatures are in degree centigrade.

Example 1 1:0 (0211930131 4 -0211, NH il Add, at room temperature 15.1 parts of lactam (a)see: Jakob, F., and Schlack, P., Chem. Ben, 96, 88, (1963)to a stired solution of triethyloxoniumfiuoroborate (b)see: Meerwein, H., et al, J. Prakt. Chem. (2), 147, 257, (1937); Meerwein, H., et al., J. Prakt. Chem. (2), 154, 83, (1940)(prepared from 10 parts of chlorohydrine and 22 parts of boron trifluoride etherate) in 50 parts by volume of methylenechloride, and stir the resultant at room temperature for 14 hours. A complex salt of (c) precipitates. Filter same. Recover unreacted (a)about 6.5 parts-from the filtrate.

Wash the collected complex salt of (c) with 3 parts by volume of saturated aqueous potassium carbonate solution, and extract compound (c) from the product with methylene chloride.

Dry. Evaporate solvent from dried basic solution. Distil remaining oil in vacuo, boiling point (B.P.) 100 to 102/ 12 mm. The yield of compound (0) thus obtained is 6.7 parts.

Infrared spectra reveal strong absorption at 1670 cmf significant of C=N- An elemental analysis for C H NOS provides the following comparison:

Analysis.Calculated, percent: C, 52.8; H, 8.2; N, 8.8; S, 20.1. Found, percent: C, 52.8; H, 8.4; N, 8.9; S, 19.1.

14.9; 0, 17.0; S, 17.0. Found, percent: C, 44.5; H, 6.7; N, 14.4; 0, 17.3; S, 17.0.

Example 3 4-thia-1,8-diaza-bicyclo(5,3,0)-decen-A -10-one.

Suspend 3.0 parts of compound (e) in toluene, and add 0.10 part of paratoluenesulfonic acid to the resulting suspension. Reflux for three hours. Evaporate the solvent, leaving a thick yellow oil, which crystallizes. Purify by sublimation in vacuo. A yield of 1 part of compound (f), M.P. 86, is thus obtained.

Infrared spectra reveal absorption at 1730 cm.- (indicative of and at 1645 cmf (indicative of CI, 17.2; s, 15.5.

Example 4 O O C 2H5 /:N j IIN; W

L C 211 0 H L At 40 add 7.5 parts of tetrahydro-y-pyrone, [Faberov, M. 1., et al. J. Gen. Chem. of the U.S.S.R., 25, 119 (1955)], (g) and a solution of 6.5 parts of HN (hydrazoic acid) in parts by volume of chloroform slow- 1y to 25 parts by volume of ethanol (saturated with hydrogen chloride). Complete the addition within three hours. When the evolution of nitrogen ceases, evaporate the resultant to dryness in vacuo. The hydrochloride of lactim ether (h) thus crystallizes. Recrystallize from absolute ethanol/diethylether to obtain 2.2 parts of the pure hydrochloride, M.P. 123 to 124.

An elemental analysis for C7H14NO2C]. provides the following comparison:

Analysis.--Calculated, percent: C, 46.8; H, 7.9; N, 7.8; CI, 19.7. Found, percent: C, 46.4; H, 8.0; N, 8.2; CI, 19.4.

The base (11) is set free from its hydrochloride by dissolving the hydrochloride in aqueous potassium carbonate (K CO solution, and extracting the resultant wtih chloroform. On evaporation of the solvent, the free base (h) remains. Distil said free base in vacuo, B.P. 70.5/ 11 mm.

Infrared spectra (5% chloroform) reveals strong absorption at 1680 cm." (indicative of An elemental analysis for C7H13NO2 provides the following comparison:

Analysis.-Calculated, percent: N, 9.8. Found, percent: N, 9.4.

Example 5 H N w 2 can-o-f K O HN O o=o-orr o=oon Admix 2.0 parts of the hydrochloride of (h) with saturated (aq) potassium carbonate solution. Extract the product with diethylether. Evaporate the solvent to obtain the lactim ether (11).

Dissolve said lactim ether (h) in 20 parts by volume of methanol. Admix 5 parts of glycine (d) with the methanol solution of (h). Stir the admixture for 14 hours at 6 20. Concentrate and filter. Recrystallize the produced that moiety of an a-amino acid which is free of primary solids from methanol. There are thus obtained 0.6 part amino and carboxylic acid groups, the u-amino acid being of compound (i), M.P. 174 to 175 (dec.). one which is derived from protein.

An elemental analysis for C H N O provides the fol- 2. The compound of the formula lowing comparison: 5

Analysis.-Calculated, percent: C, 48.8; N, 16.3; H, 7.0. Found, percent: 0, 48.5; N, 15.9; H, 7.4. r S

Example 6 0:0-011 H l/ W x) 10 3. A compound of the formula EN 0: N

0: OH U s/W-O-(loweflalkyl N Reflux 0.6 part of amidino acid (i) in Xylene containmg a trace of paratoluenesulfonlc acid. After separating out some water, the refluxing suspension becomes a yellow solution. Decant the yellow solution from insolubles present therein, and evaporate said solution to dryness. The W h r base (i) crystallizes. Filter said base and wash same with S cyclohexane. Recrystallize from absolute ethanol. A yield of 0.6 part of (j), M.P. 111 to 112, is thus obtained Infrared spectra (5% in methylene chloride) reveal strong absorption at 1735 cm.- (indicative of ring 4. The compound of the formula 5 A compound of the formula and medium absorption at 1650 cm. (indicative of that moiety of an a-amino acid which is free of primary amino and carboxylic acid groups, the a-amino acid being one which is derived from protein. An elemental analysis for C H N O provides the fol- 6. The compound of the formula lowing comparison:

Analysis.-Calculated, percent: C, 54.5; H, 6.5; N, 18.2; 0, 20.8. Found, percent: C, 54.8; H, 6.7; N, 18.2; I o, 20.8. 0:

The hydrochloride of (j), prepared according to standard procedures, has a melting point of 216 to 217, with 7. A compound of the formula decomposition. The elemental analysis of the hydrochloride, CqHnClNgO provides the comparative data:

Analysis.Calculated, percent: N, 14.7; C1, 18.6. mo-(lowemlkyl Found, percent: N, 14.5; C1, 18.3.

It is thought that the invention and its advantages will be understood from the foregoing description. It is appar- 8. The compound of the formula ent that various changes may be made in the processes, the intermediates and in the final products without depart- O C H ing from the spirit and scope of the invention of sacrificing 0 l a 5 its material advantages, the processes, intermediates, free bases and acid addition salts hereinbefore described being merely illustrative embodiments.

What is claimed is:

1. A compound of the formula EN 8 WALTER A. MODANCE,-Primary Examiner. JAMES A. PATTEN, Examiner. 

1. A COMPOUND OF THE FORMULA 